The section below appears to be the phase where the shard gives up entities 
it owns.  I was wondering about this process when the member is the 
ShardCoordinator.  Is the shard coordinator still running until the shards 
are all rebalanced?  I'm interested when the shard coordinator and other 
singletons are restarted on another shard.  For availability to be 
minimally impacted, I was hoping that everything in the shard would be 
moved first, then the coordinator would be started on another node and 
await a final handoff from the old coordinator thereby limiting the gap in 
time of not having a coordinator.

# Graceful shutdown of the Cluster Sharding regions.
  cluster-sharding-shutdown-region {
    timeout = 10 s
    depends-on = [before-cluster-shutdown]

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